I think it is far more likely that the United States of America will start a nuclear war, than any non-state terrorist organisation.
I say that based on the following evidence:
1. Many of the neocons believe in pre-emptive nuclear strikes as the way forward. US official policy is that it reserves the right to use nuclear bombs on non-nuclear armed countries.....an outrage.
2. The US govt. certainly believes in pre-emptive wars ( a world first, and in violation of all international laws), as we have seen with it's invasion of Iraq.
3. The US practices terrorism in all it's forms, by threatening and coercing smaller nations which are no military threat to it, under the subterfuge of their harbouring terrorists, or having non-existent nukes.
4. The US has by far the biggest arsenal of nuclear warheads, and is the only country in the world to have ever used the nuclear bomb on another country. It is clear now that this action which killed 200,000 people was militarily unnecessary.
5. The closest times the world has ever come to nuclear armageddon has on each occassion involved the US. This was in the 1963 Cuban missile crisis when the US threatened nuclear attack against Cuba and Russia, for putting nukes in Cuba, even though hypocritically the US had masses of nukes in West Germany and Turkey, just as close to Russia as Cuba was to the US. There was also the time in 1983 when during a Nato war exercise, Nato warplanes aggressively buzzed Russian positions in East Germany. The Russians thought they were being attacked for real, and started proceedings to launch nuclear missiles. Luckily a double agent working for the KGB contacted Britain's MI6, and the UK's prime minister, Margaret Thatcher rang Ronald Reagan in the middle of the night. He had the good sense to stop the NATO war exercises.
Another time came in January of 1995. The US had warned the Russians that they were test launching a missile from a nuke sub off the coast of Norway. But the Russians, who are not as efficient in their military as the US, and have rusty satellites and malfunctioning computers, had forgotten. So when the missile was launched there was great alarm. Boris Yeltsin for the first time in history opened up the computer to launch Russian nukes within 3 minutes. Luckily the missile didn't go towards Russia, and he decided to not press the button.
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And for all of those of you who want to make up survival kits to survive a nuclear winter......are you kidding???!! Are you mad??? There is no way you will survive a nuclear winter for long. You might as well get it over with and die in the first attacks. You might as well bend down and kiss your ass goodbye!!
It is insane to think you could ever survive a nuclear war and the ensueing nuclear winter. Possibly George Bush and his cronies would survive for a few years in the underground bunkers.....but even him and his friends would die when the oxygen and food ran out and they had to go up and eat contaminated plants, and be exposed to the radioactivity and freezing conditions.